Display device

1. A display device, comprising: a display panel having a plurality of pixels and configured to be wound or unwound; and a back cover attached to one surface of the display panel and having a plurality of grooves, wherein the grooves include: a plurality of first grooves placed on the one surface of the back cover facing the one surface of the display panel; and a plurality of second grooves placed on the other surface of the back cover opposite to the one surface of the back cover, and wherein a depth of each of at least one of the first grooves and at least one of the second grooves is smaller than a maximum thickness of the back cover.

2. The display device according to claim 1 , wherein a sum of a depth of one of the first grooves and a depth of one of the second grooves is substantially equal to the maximum thickness of the back cover.

3. The display device according to claim 1 , wherein a sum of a depth of one of the first grooves and a depth of one of the second grooves is smaller than the maximum thickness of the back cover.

4. The display device according to claim 3 , wherein the back cover further includes an intermediate part between the one surface of the back cover and the other surface of the back cover.

5. The display device according to claim 1 , wherein the first grooves are not aligned with the second grooves.

6. The display device according to claim 1 , wherein the first grooves overlap at least a part of the second grooves.

7. The display device according to claim 1 , wherein the display panel is configured to be wound or unwound in a first direction, and wherein at least one of the first grooves and at least one of the second grooves each has a width in the first direction which is smaller than a width in a second direction perpendicular to the first direction.

8. The display device according to claim 1 , wherein: the display panel is configured to be wound or unwound in a first direction and in a second direction perpendicular to the first direction, and at least one of the first grooves has a width in the first direction which is smaller than a width in the second direction, and at least one of the second grooves has a width in the first direction which is larger than a width in the second direction.

9. The display device according to claim 1 , further comprising: a filling member filling one or more of the first grooves and the second grooves.

10. The display device according to claim 9 , wherein the filling member covers one or both of the one surface and the other surface of the back cover.

11. The display device according to claim 1 , wherein the grooves have at least one of a rectangular shape, an oval shape, a ribbon shape, a dumbbell shape, and a diamond shape.

12. The display device according to claim 1 , further comprising: a roller configured to wind or unwind the display panel and the back cover; and a housing configured to house the display panel and the back cover in a wound state.

13. A display device, comprising: a display panel configured to display an image; a back cover supporting one surface of the display panel, and including a plurality of first grooves and a plurality of second grooves, the first grooves being on one surface of the back cover facing the one surface of the display panel and the second grooves being on another surface of the back cover; a housing part configured to house the display panel and the back cover; and a roller unit configured to wind or unwind the display panel and the back cover at least in a column direction.

14. The display device according to claim 13 , wherein the first grooves and the second grooves are staggered from each other.

15. The display device according to claim 13 , wherein the first grooves overlap at least a part of the second grooves.

16. The display device according to claim 13 , wherein the first grooves do not overlap the second grooves in plan view.

17. The display device according to claim 13 , wherein the back cover further includes: a first part in which the first grooves are disposed; and a second part in which the second grooves are disposed, and wherein the first part and the second part are integrated into a single body.

18. The display device according to claim 17 , wherein the back cover further includes an intermediate part between the first part and the second part, the intermediate part being integrated into the single body with the first part and the second part.

19. The display device according to claim 13 , wherein the back cover further includes: a supporting area at a lowermost end of the back cover and fixed to the roller unit; and a flexible area between the supporting area and an uppermost end of the back cover, and overlapping the display panel, and wherein the first grooves and the second grooves are placed in the flexible area.

20. The display device according to claim 13 , wherein: at least one of the first grooves has a width in the column direction which is smaller than a width in a row direction, and at least one of the second grooves has a width in the column direction which is smaller than a width in the row direction.

21. The display device according to claim 13 , wherein: at least one of the first grooves has a width in the column direction which is smaller than a width in a row direction, and at least one of the second grooves has a width in the column direction which is larger than a width in the row direction.